Abstract:China plays a leading and exemplary role in world's canal construction and canal economic and cultural exchanges.This paper summarizes the development history of canal in China,also the basic information and functional value of the world's top 10 canals,and then expounds dreams and plans of canal in modern history in China.In the new era,the development of inland navigation has adjusted to the comprehensive benefits of national economy,industrial layout,social environment and other aspects.This paper analyzes the planning background and significance of cross-river system connection in the new era,emphatically introduces the planning process,engineering difficulties and technical innovations of Pinglu Canal,which can be used as a reference for the planning and consultation of similar projects.

Abstract:Recent years,Pinglu Canal is put into construction,and the preliminary research on Hunan-Guangxi Canal and Jiangxi-Guangdong Canal is orderly promoted.The development of super large canals is attracted high attention.We take comprehensive benefits of the development of super large canals as the entry point,analyze the overall planning and the characteristics of super large canals.Then taking into account various factors such as national strategic requirements,economic development characteristics and industry development orientation in the new development stage,we propose that comprehensive benefits of super large canal development should focus on four aspects based on diversified value theory and public project economic evaluation methods,such as the value to national strategic implementation,the value of reducing social logistics costs,the value of comprehensive utilization of water resources,and the value of leading comprehensive development along canals,optimizing regional economic development and national spatial pattern.Taking Pinglu Canal as an example,we conduct empirical analysis to provide support for the construction of comprehensive benefit evaluation method system for the development of super large canals in the new development stage.

Abstract:Pinglu Canal starts from Pingtang River Estuary,a tributary of the Xijin hub reservoir in the upper and middle reaches of the Xijiang shipping trunk line,and ends at Beibu Gulf Port.It is a networking project that optimizes and enhances the national water transportation network and accelerates the construction of a national comprehensive three-dimensional transportation network.It is a landmark project for building a new land-sea channel in the western region and accelerating the construction of a strong transportation country.According to the deployment of National Comprehensive Three-dimensional Transportation Network Planning Outline,the overall plan for Beibu Gulf Port is currently being prepared,and it is necessary to comprehensively consider the spatial layout and plane layout of river-sea intermodal transportation hub of Pinglu Canal.This paper comprehensively considers the river-sea intermodal transportation volume of Pinglu Canal,the construction conditions and resource capacity of each port area in Beibu Gulf Port,as well as the utilization of existing port resources.Based on the principle of “nearby transportation and sufficient stock”,a river-sea intermodal transportation hub layout is proposed according to local conditions,with a plan for matching the capacity of large and small berths and efficient transportationorganization.At the same time,it also proposes to clarify the division of the navigation area of Fangchenggang,study the opening of Fangchenggang Water Transport and Port Dredging Channel (Huangcheng'ao Canal),and orderly promote the upgrading and renovation of existing docks,so as to provide technical support for the smooth operation of river-sea ntermodal transportation after the construction and operation of Pinglu Canal.

Abstract:The hydrodynamic conditions of Modaomen Estuary are complex and the wave action is obvious.However,There is relatively little research on the residual currents characteristics in Modaomen Estuary under the influence of waves.This article is based on the SCHISM model and establishes a two-dimensional wave-current coupling numerical model.By comparing the characteristics of estuarine residual current in estuaries with and without wave influence,the impact of waves on the residual current is analyzed.Qualitatively analysis is conducted on the evolution characteristics of No.4 Jiaobei Sand from the perspective of residual current.The results show that the residual current force in the west branch of Modaomen estuary is relatively strong,and the residual current at the exit of Longshiku waterway on the west side is relatively small.Near the No.4 Jiaobei Sand,wave action is more obvious,and the residual current force is somewhere in between.Direction of residual current has a great change under the action of wave.Under the action of the strong residual current from the west branch and the wave lifting force,the ridge line of No.4 Jiaobei Sand has a tendency to deflect clockwise to the west.

Abstract:The construction of Yangshan Deep-water Harbor area has a significant impact on the distribution of water and sediment in the surrounding waters,and an in-depth analysis of water and sediment characteristics after the construction of the port is of great significance to the later development of the port area.Based on the Landsat-8 OLI remote sensing image of Yangshan Deep-water Harbor in recent 6 years,we analzye spatial-temporal variation characteristics of surface suspended sediment concentration in Yangshan Deep-water Harbor.The results show that the suspended sediment concentration of waters in Yangshan Deep-water Harbor in winter is obviously higher than that in summer,and the difference between the suspended sediment concentration in winter and summer is nearly once.The suspended sediment concentration in the spring tide is higher than that in the neap tide,and the suspended sediment concentration in the high tide is higher than that in the low tide.Under the influence of the trumpet topography,the tidal current is strong,and the tidal pattern has a more obvious influence on the suspended sediment concentration.

Abstract:Inland river container transportation is not only an important part of building a world-class port cluster in the Yangtze River Delta,boosting the comprehensive multi-dimensional transportation and economic integration development in the Yangtze River Delta,but also an important direction for transportation structure adjustment,energy saving,emission reduction and carbon reduction,which is in line with the national strategic direction.This article analyzes the development characteristics of river container transport in the Yangtze River Delta,combined with the influencing factors of the layout of inland river container transportation corridors.Through a three-phase analysis method combining qualitative and quantitative analysis,the layout levels of the main inland river container transportation corridors in the Yangtze River Delta region are determined.On this basis,this paper puts forward suggestions such as making a planning of inland river container transportation corridors,accelerating the construction of the main corridors at a high level,optimizing the logistics organization system,and establishing the mechanism of regional integrated development,etc.

Abstract:This paper discusses the design of a vertical double cylindrical caisson structure that combines both operation and prevention functions.It proposes the elevation design standards during ship operations that the average overtopping is less than 0.1 L/(s·m) and the overtopping is less than 50 L/(s·m) during storms (once in a hundred years).The paper studies two kinds of connection modes of double cylinders using concrete thin plates and thick plates,and introduced their stress characteristics,calculation models,and internal forces.It summarizes the recommended calculation methods for the design of vertical embankment bottom protection,and it is found that the CEM chart method result is consistent with the 3D physical model test,the OCDI method has a larger calculation result,and the national standard mapping method has a smaller calculation of block stability weight.Furthermore,it studies the structural scheme of setting the sea side wave wall in the middle of a circular caisson with a reverse arc angle,and proposes that the EurOtop method has wide applicability and the results are close to the experimental values.Then,a method for protecting the embankment head is proposed by sealing the filling between the caissons with prefabricated I-blocks and connecting the four caissons at the embankment head with thick plates as a whole.The feasibility of the structural scheme has been verified through conducting 2D and 3D model experiments.The research results can provide reference for similar designs.

Abstract:To further study the horizontal cumulative deformation characteristics of pile group foundation,as well as the variation patterns under the influence of factors such as the pile itself,load factors and soil around piles,this paper combines the implementation process of USDFLD subroutine and ABAQUS three-dimensional modeling process to study the cumulative deformation characteristics of pile groups using finite element calculation results.By changing parameters such as pile distance,pile number,load incidence angle,loading frequency,initial elastic modulus of soil,pile-soil interface friction coefficient and other parameters,the horizontal cumulative deformation characteristics of pile groups are further studied,and the variation rules under the influence of factors such as pile itself,load factor and soil around pile.The effect of soil weakening around piles on the cumulative deformation characteristics of pile group foundation is often ignored in numerical simulation.Therefore,this article also studies how to achieve soil softening in numerical model.Finally,the horizontal cumulative deformation characteristics of pile groups and the variation rules under various influencing factors are obtained.For example,under the influence of pile body itself,the horizontal cumulative deformation of pile caps decreases with the increase of pile distance and pile number,the load-displacement hystericity ring becomes fuller with the decrease of pile number,and the soil nonlinearity becomes more obvious.

Abstract:Seismic isolation design has developed rapidly in recent year,and has been widely used in the field of civil buildings,roads and bridges with good effect,but the seismic isolation design has no obvious effect on conventional docks.For pile supported LNG pier,due to their high requirements for seismic design,the seismic load usually serve as the control function of the structure,especially in high seismic regions,so it is more suitable to adopt seismic isolation design.Referring to the practice of other industries,this paper recommends the isolation design method suitable for pile supported LNG pier.In structural design,a scheme combining with prefabricated structure is proposed,which has the advantages of rapid construction and timely replacement.The research results can provide reference for the design of pile supported LNG pier in strong earthquake area.

Abstract:Based on the South China Sea emergency salvage and support base project,we optimize the crest elevation of the sloping breakwater allowing wave overtopping to minimize investment while upholding the stability of harbor mooring conditions,wharf structure,and structural safety of breakwater.By conducting wave section physical model tests,we simulate secondary waves behind the breakwater and overlaid with diffracted waves calculated by mathematical models.Then we calculate wave forces on wharf structure for varying crest elevations,carry out the structural safety analysis of wharf by finite element software,and verify the stability of the breakwater structur by wave section physical model tests.The results indicate that for projects with separate dock and breakwater layouts,breakwater protection requirements can be suitably reduced.Ensuring the crest elevation does not exceed the design high water level + H13% of once every two years effectively maintains the safety and reliability of breakwater and wharf structures.

Abstract:According to the needs of upgrading,demolition and reconstruction of the gravity caisson wharf,the basic data such as the current status of caisson,the transportation path and distance,and the temporary storage site are collected,and the design of the caisson reuse scheme is carried out.Combined with the construction conditions of project example and the characteristics of LNG wharf with high design standards,six risk factors are extracted from the three major technical points of design,construction and economic,including wharf plane design,caisson detection and evaluation,caisson floating or removal risk,construction technology,engineering progress and engineering investment.By constructing the risk situation structure model,the risk factors are measured with clear quantitative indicators,which provides an important basis for recommending scheme 2,namely only the backfill material inside the caisson is used for the LNG wharf.The risk and investment of the scheme are controllable,and the construction progress is fast,which provides a stable working face for the subsequent construction of the new wharf on schedule.

Abstract:As a deep foundation structure with high bearing capacity and wide application range,pile foundation is widely used in domestic and foreign port and water transportation projects.However,settlement of pile foundation will cause damage to the superstructure or affect the normal use of mobile machinery,so settlement calculation should be carried out during design for pile foundation to ensure that the deformation of pile foundation is within the allowable limit of structural safety and normal serviceability.Domestic and foreign standards and related engineering design manuals provide many suggestions on the settlement criteria and calculation method for pile foundation.In terms of settlement criteria,Chinese standards have more detailed provisions.In terms of calculation method of single pile settlement,foreign standards have more research on basic parameters such as pile compressibility,soil elastic modulus and Poisson's ratio,etc.Their linear theoretical formulas have more practicability.By comparing the results of the domestic pile foundation code,European BS EN code and the common pile foundation design manual in the United States,a pile foundation settlement calculation is carried out using a certain approach bridge project in the Middle East as an example.Various standard differences were summarized and extracted,aiming to provide reference for the settlement criteria and calculation method in the process of pile foundation design in domestic and foreign water transportation projects.

Abstract:To reduce excavation volume,a horizontal diversion connecting at the bottom of the ship lock is typically adopted for the side support hole water delivery system with sidewall ports of the water-saving ship lock.The diversion uniformity of the connecting culvert is the core challenge in the water delivery process of such ship locks.Addressing this issue,based on a water-saving ship lock project in China,a three-dimensional hydraulic numerical simulation method is used to optimize the layout of the connecting culvert.The results show that increasing the interface area between the connecting culvert and the long culvert of lock wall can effectively mitigate the flow oscillations in the lateral culverts.The diversion uniformity of connecting culvert is characterized by K,defined as the ratio of the width on both sides of the horizontal diversion opening to the radius on both sides of the flow splitter.When K=1.064,the flow distribution uniformity in the lateral culverts,the outflow uniformity from the sidewall port,and the hydraulic conditions in chamber are better.The research results can provide technical references for the layout of connecting culverts in similar water-saving ship locks.

Abstract:The waterway in the middle reaches of the Yangtze River has the characteristics of large hydrological variation,variable riverbed erosion and sedimentation,and complex river and lake relationships,making it difficult to determine the dredging timing.This paper reveals the factors affecting the dredging timing and establishes a method to determine the dredging timing.The results show that the main influencing factors of dredging timing include water level process,riverbed erosion and sedimentation,dredging capacity,and navigation status.At the same time,the values of parameters such as dredging design water level,maintenance water depth,reserved water depth,maximum underwater vertical depth of ship arm extension,dredging volume,dredging efficiency are given,and the method for determining dredging timing based on these parameters is determined.Taking the maintenance dredging of Taipingkou waterway in 2023 as an example,the water-level process from 2018 to 2022 is analyzed.The optimal dredging timing is from early September to the end of October in 2023.The research results can provide technical support for the dredging of similar waterways.

Abstract:To analyze the impact of unsteady flow on downstream navigation during sudden load shedding and turbine cutting operation of power plant units,this paper takes Xiangjiaba hydropower station as the research object,Establishes a 1:100 normal physical model,simulates the turbine cutting conditions of Xiangjiaba hydropower station units,analyzes the changes in water level and flow velocity in the downstream reach caused by unsteady flow under different turbine cutting numbers of 8 units.At the same time,combines with self-propelled ship model tests to study the impact on safe navigation of ships.The results show that when the power plant units cut off 1-8 units respectively,under the condition of rapid water replenishment,the maximum hourly variation of downstream water level is 0.89 m/h,which does not exceed the allowable value in the power plant operation and scheduling regulations.The water level changes caused by unsteady flow mainly occur in the river section above Tongzilin,while the flow velocity changes mainly occur in the river section above Heshangyan.The flow conditions meet the requirements of ship navigation.The research results can provide technical support for the dispatch and operation of power plants,downstream channel maintenance,and ship navigation.

Abstract:Rapid shoal is a common type of beach danger in mountainous rivers,and it is difficult to be effectively regulated by conventional regulation methods,so the regulation method of beach potential transfer is put forward.The method is to transfer the original beach to the new beach,which has conditions to form a slow flow area for ships to go up to achieve overall navigation conditions.Taking the Wuming Beach section in Manting reach of Lancang River as an example,this paper analyzes the rapids characteristics,points out the causes of the difficulty by conventional regulation methods such as expanding the drainage section method,expounds the basic idea,engineering layout and analysis method of regulation effect of the beach potential transfer method,and describes the applicable conditions and scope of the beach potential transfer method.The beach potential transfer method is ideal for regulating beach groups with strong interrelatedness and significant impact from conventional regulation methods.The beach reduction index XF should not be excessively low after initial regulation,and 0.8—1.0 is suitable.The new shoal requires effective water confinement,but the resulting hazard area must not be excessively wide,ensuring a navigable area for upstream navigation.

Abstract:In order to analyze the salt water movement characteritics in different depths of the salt collecting pit of the estuarine ship lock,we build a three-dimensional numerical model of the salt collecting pit for mitigation salt intrusion based on the species transport model and the LES turbulence model of the CFD software,and use the finite volume method discretization.Based on the test results of water tank for mitigation salt intrusion in the salt collecting pit,we verify the salt water movement pattern,salt water movement speed and vertical salinity distribution,and build a three-dimensional numerical model of different depths of salt collecting pit in estuarine ship lock.The results show that the mitigation salt intrusion effect of salt collecting pit is related to the depth.The distance of salt water intrusion increases with the depth of the salt collecting pit,but the salinity of the approach channel and salt-fresh water exchange rate decreases with the depth of the salt collecting pit.In general,the depth of the salt pit is directly proportional to the salty prevention effect.When the depth of the salt pit is greater than 12 m,the distance of saltwater intrusion is more than 515 m,the salinity of the approach channel is less than 0.23‰,and the salt-fresh water exchange rate is less than 50%.

Abstract:In view of long time-consuming problem of rechecking the bending radius of the channel after optimizting and adjusting the navigation mark,based on the characteristics of the channel maintenance site,a quick estimation method for the bending radius of the channel marking is proposed.The method is obtained based on the connecting line of the adjacent navigation mark action distance,the circumscribed arc,the navigation width,the trigonometric function equation,and the coordinate system theory.Through the derivation of the sine and cosine theorems,the radius of the circumscribed circle of the navigation mark connecting line can be solved.Based on the coordinate system,the radius of the circumscribed circle of the navigation mark connecting line with obstruction can be calculated by using the triangular analysis.The verification of the setting mark in three typical curved river sections has verified the correctness and timeliness of the rapid estimation of the channel bending radius.The results can provide reference for how to quickly estimate the bending radius on site,so as to accurately and timely check the bending radius of the channel.

Abstract:With the upsizing and standardization of ships,the integral lock chamber which is suitable for high water head and high lock wall has been widely used.To explore the influence of the reserved wide joint on the internal force of the baseplate of the integral lock chamber,based on modified Mohr Coulomb model,this paper uses Midas GTS NX to perform finite element analysis of Guanqiao lock chamber.The results show that:1）The modified Mohr Coulomb Model has more advantages in describing soil deformation than Drucker Prager model.2）Compared with the absence of wide joint,the reserved wide joint can significantly reduce the hogging moment in the midspan of the baseplate.3）The later the time of closing joint is,the smaller the maximum of the hogging moment of the baseplate becomes.4）Considering the internal forces of the baseplate and the stability of the lock wall,when the level of the backfill soil behind the lock wall reaches the elevation of 35.5 m,the baseplate of Guanqiao lock chamber should fill the reserved wide joint.5）During completion and operation periods,the maximum of the sagging moment and hogging moment of the baseplate with reserved wide joint occur under the conditions of the completion and maintenance respectively,and the maximum and minimum of the foundation stress occur under the conditions of the high-water-level operation and maintenance respectively.

Abstract:The assessment of ecosystem service value in the river section of waterway regulation projects is a crucial indicator for measuring the impact of engineering construction on the sustainable development of ecosystems.Taking the waterway regulation project from Chaotianmen to Fuling in the upper reaches of the Yangtze River as a case study,this research employs land-use changes as a focal point and utilizes the equivalent factor method to assess the ecosystem service value in the pre-construction,mid-construction,and post-construction phases.The results show that the ecosystem service value in Chaofu section decreased by 1.40% from 2015 to 2018 but subsequently increased by 5.73% from 2018 to 2021.Among the twelve service functions,hydrological regulation has the highest proportion,followed by shipping service value,both showing an upward trend before and after the project.Different land types contribute differently to the ecosystem service value,with water bodies consistently being the main contributing and sensitive factors.The research findings can provide theoretical support for promoting the coordinated development of channel construction and ecological protection.

Abstract:The Poyang Lake area,at the downstream of the Xinjiang,is featured by complex terrains and water system with multiple river branches.The selection of dam site has a large range of river sections,and the selection of the scheme of the hub dam site is complicated.Taking the Bazizui navigation and hydropower hub project in the Xinjiang as an example,based on meeting the requirements for navigation and the connectivity of the cascade in the upstream and downstream areas,we use a methodology for analyzing the pros and cons of various dam sites considering the functionality of each dam site,reasonable arrangement of river channels and banks,building layout,and minimizing reservoir inundation,and propose the idea of dam site selection.Then we carry out comprehensive comparison and selection of dam site selection from topography,geology,hub layout,project quantity,navigation conditions,channel connectivity,construction conditions,reservoir inundation,and overall project investment,and obtain the recommended dam site for the Bazizui navigation and hydropower hub project.Through a demonstration of the scheme,we clarify the strategy for dam site selection and hub layout,and successfully solve the problem of dam site selection in the complex water system and topographical conditions of the river mouth lake area.

Abstract:We conduct an analysis of the operational status of navigation structures in the channel regulation project of Luochengzhou section in the lower straight reach of the Yangtze River.Using statistical data from in-situ surveys conducted since the completion of Luochengzhou regulation buildings,combining with analyses of river regime,local sediment dynamics,and hydraulic changes,we investigate the characteristics and trends of buliding damage,and discuss the cause of damage.The results show that the protection project implemented in the Luochengzhou head area effectively reduces the distributary flow ratio of the right branch.However,significant damage occurs to LR1,LR2 spur dike protection mattress and LR1,LR2 bottom protection belt,weakening the flow restriction effect on the right branch.Post-project implementation,the turbulence in the right branch of the Luochengzhou Waterway leads to extensive erosion pits formed by various hydraulic actions such as dam flipping and circumventing flow.This results in increasing slope gradients or direct intrusion into the mattress,causing damage of building.The current erosion pits may further develop,underscoring the need for ongoing monitoring of local sediment dynamics and building changes.

Abstract:The open silty silt channel is silted all the year long.How to balance navigational safety and the economic feasibility of dredging projects while considering the influence of sedimentation characteristics has become a focal point of concern in the industry.Based on the analysis of measured data and numerical simulation,this paper establishes a mathematical sediment model considering the coupling of wave and current for an open silty silt channel,and compares the annual re-sedimentation rates of various maintenance dredging schemes to evaluate the sensitivity of these rates to different dredging indexes.The results show that the increase of dredging width of open silty silt channel can effectively reduce the annual re-sediment.The research results can provide reference for the optimization of the maintenance scheme of the open silty silt channel.

Abstract:ompared with the conventional ship lock,there are some critical issues for water-saving ship lock,such as how does the design of the water-saving pool affect the layout of the water conveyance system of the ship lock,and whether the doubling of the number of valve opening and closing times and the reduction of the working head can control the extension of the water conveyance time.In this paper,the water-saving pool and water conveyance system of the Madian ship lock are studied by means of hydraulic calculation and three-dimensional water flow digital model test,and an innovative water conveyance system type combining “side branch hole of the sluice bottom corridor” + “first-class water-saving pool” is proposed.The water conveyance time of this water conveyance system can meet the requirements of “the design water conveyance time is not more than 10 min”,and the reduction of the water conveyance efficiency of the ship lock by the water-saving operation is in line with the design expectations.The water flow is stable,and the layout of the water conveyance system and the water-saving pool are reasonable.

Abstract:To study the docking operation method of the Three Gorges ship lift,the paper analyzes the operation process,working principle and reliability of docking stop device of the Three Gorges ship lift,the data show that the overall reliability of the docking stop device is high.According to the working principle of docking stopping device,combined with the operation experience of Three Gorges ship lift,the “RTA three-element method” is put forward to judge the trough's docking position,so as to ensure the safety of the trough's docking stopping.At the same time,according to different operating conditions,the large stroke re-docking method,small stroke re-docking method and forced signal re-docking method are proposed to realize the accurate stopping of the Three Gorges ship lift.The research results can improve the operation safety and efficiency of the Three Gorges ship lift,provide technical guidance for the trough's docking stopping of the Three Gorges ship lift,and provide reference for other ship lift trough's docking stopping operations at home and abroad.

Abstract:Since the operation of Xinglong Hub on the Han River,the riverbed under the dam has been severely eroded,and the lowest navigable water level downstream has decreased significantly during the dry season.To ensure the safe operation of Xinglong Hub,the normal water storage level of the Hub needs to be lowered synchronously to adapt to the decrease in water level below the dam,resulting in insufficient threshold water depth for the upper and lower locks of Xinglong Shiplock during the dry season,and low navigation guarantee rate for ships of 1 000-ton.In response to the problem of water level changes caused by riverbed erosion under Xinglong Hub Dam,this paper analyzes the current hydrological and sediment characteristics and dry water hydrological situation of the Han River,and uses one-dimensional and two-dimensional long series annual water and sediment mathematical models to rolling calculate the riverbed erosion and sedimentation and water level changes under Xinglong Dam for 60 and 50 years.It is found that the water level corresponding to the same flow rate under the dam gradually stabilized after 40 years,considering the implementation of the 2 000-ton waterway regulation project and the annual decrease of 0.1 m in water level at Hankou Station,the water level under Xinglong Hub Dam may decrease by 3.77 m by the end of 50 years.The aim is to provide reference for the determination of the design water level of the relevant engineering projects in the section under Xinglong Dam of the Han River.

Abstract:Aiming at the power supply issue of the monitoring system for the floating mooring column of the single ship lock,a wireless power supply scheme for the floating mooring column of a large single-stage ship lock is proposed.We designed the circuit structure of the wireless power supply system and simulated the coupling mechanism to obtain the optimized design parameters of the main circuit.The device structure of the wireless power supply system's transmitter and receiver is designed,which can automatically align and follow up at a certain water level.The prototype of wireless power supply system is manufactured and installed for testing.The results show that when the transmitting and receiving ends are aligned,the wireless power supply system is activated for charging,achieving simultaneous lifting and charging.The receiving end of the wireless power supply system can effectively receive the transmitted electrical energy,convert it into energy flow,and transmit it to the monitoring system battery,achieving an energy transmission of 184.36 W with an efficiency of 67.3%.

Abstract:Since the construction of the Three Gorges Reservoir,the waterway conditions have been greatly improved,the flow of ships has increased,and ships have developed to large scale.Traditional navigational aids cannot meet the needs in the new era.This article proposes a new intelligent floating drum structure that can adapt to large water level fluctuations in the Three Gorges Reservoir area.The force process of the floating drum during water level changes is simulated through the dynamic force analysis and construction of a floating drum mechanical model.Based on the above,the intelligent lifting technology is proposed.The application of the intelligent lifting technology and power supply systems of floating drums in the reservoir area are analyzed deeply.The results show that intelligent floating drums can adapt well to the large water level fluctuation in the Three Gorges Reservoir area,and its technical performance runs well.It is suggested that in the future,the promotion and application of intelligent floating drums should be accelerated to meet the navigation assistance needs of the Three Gorges Reservoir area in the new era.

Abstract:Aiming at the problem of sediment deposition obstructing navigation in the initial stage of 175 m experimental impoundment,we make a comprehensive analysis of changes of channel conditions,causes of shoal navigation obstruction and dredging technology in the Three Gorges Reservoir area in the past ten years based on the measured hydrological and river terrain data,as well as the channel maintenance dredging scheme of the Three Gorges Reservoir area from 2010 to 2022.The results show that by properly increasing the water depth of the trench and combining dredging with blocking,it is beneficial to the transportation of pebbles,the stability of the channel and the remarkable dredging effect.From the perspective of dredging timing,the effective combination of the Three Gorges Reservoir scheduling and dredging beach risk characteristics,reasonable arrangement of construction timing,not only improve the construction efficiency,but also alleviate the contradiction between construction and navigation.

Abstract:The river embankments preserved in the lower reaches of the urban section of the Pinglu Canal have the characteristics of small cross-section and light mass of protection blocks.After the canal is navigable,under the frequent action of ship waves,it may have a certain impact on slope stability.To analyze the safety and stability of existing protection blocks under the action of ship waves,we build a typical river channel and ship model using 3D graphics software,calculate the slope toe wave height values generated by ship waves under different ship speed conditions through numerical simulation,and determine the corresponding stable mass of blocks.The results show that under the design high water level conditions,when the speed of the 5 000 DWT bulk cargo ship is 3 m/s,the generated ship waves can cause instability and detachment of the poorly embedded armor blocks.It is recommended that the navigable ship speed in this section should not exceed 4m/s.

Abstract:To enhance the collection,integration,analysis,and application capabilities of deep-water navigation data,a construction practice of the Deep-water Navigation Channel Field Observation Data Service Platform is conducted at the Obeservation and Research Base of Transport Industry and of Water-Sediment Environment and Engineering Safety of Nanjing Yangtze Deep-water Channel.The service platform adopts a B/S architecture,connects various data clusters through technologies such as the Internet of Things (IoT) and distributed construction,combined with commonly used network transmission protocols,and realizes the integration and governance of heterogeneous historical data from multiple sources,the access of real-time monitoring data and the aggregation of third-party data.Furthermore,it develops special applications such as the data portal,waterway “One Map”,engineering application,monitoring dashboard,and the water level prediction application.The platform realizes the aggregation and sharing of data,with a thematic focus on deep-water navigation channels.

Abstract:With the continuous improvement of the requirements for digitization and informatization in the field of engineering construction,in view of the problems existing in the application process of BIM (building information model),such as low integration with the site and information interruption at various stages,AR (augmented reality) technology has the function of superimposing models in real scenes.The project BIM+AR visual management platform is built by taking the supporting wharf project of Yantai Port west port area liquefied natural gas (LNG) project as an example.On the basis of building the project electronic sand table and carrying out the basic application of BIM,the application advantages of BIM+AR technology in high pile wharf are explored.Through the comprehensive application of completion simulation,construction guidance,verification and comparison,and progress control etc.It can effectively improve the construction efficiency and fine management level of construction.

Abstract:Digital twin waterway is a new type of waterway infrastructure formed by the integration and development of the new generation information technology and traditional waterway specialties.Based on the practical application of digital twin waterway engineering,we expound the concept of digital twin waterway,and build a five-dimensional architecture including physical entity waterway,spatiotemporal data,twin drive engine,virtual digital waterway and scene service application.According to the logical relationship between the digital space and the physical world,we propose a five-level digital twin channel maturity level characterized by “simulation (L1),mapping (L2),control (L3),prediction (L4) and optimization (L5)”.Based on the five-dimensional architecture and the five-level maturity level,we design a set of digital twin channel maturity evaluation model,and carry out the grading evaluation of a section of digital twin waterway,which can clearly show its strengths and weaknesses in the construction of the digital twin waterway.The results show that the digital twin waterway maturity level evaluation model proposed in this paper can effectively guide the construction of digital twin waterway.

Abstract:Digital twin is an emerging technology through digital modeling and simulation of the physical world,and as an important way to realize digital transformation and promote intelligent upgrading,it provides new solutions for real-time monitoring,efficiency improvement and problem prediction of smart port and waterway.In this paper,a lightweight digital twin platform ″Panorama Box″ is built by integrating BIM and GIS technologies,which has the functions of project management and scene construction from the Web terminal,and realizes zero-code operation.This paper introduces the innovations of the product from the aspects of system architecture and function design,and takes the application of Shanghai Huangpu River waterway project as an example to further elaborate the advantages and innovations of the platform in the field of smart port and waterway.

Abstract:To solve the traffic congestion in the port and alleviate the interruption phenomenon of urban collection and distribution,it has become a new trend to construct the future logistics system with the thinking of three-dimensional traffic.In view of above problems,the research of key technologies of intelligent air rail collection and distribution system is carried out.The air rail transport process is designed and ESIA method is adopted to simplify the transport path and splice the process.The adaptive dynamic ant colony algorithm is used to solve the reconstruction,integration and iteration difficulties of the air rail collecting and distributing system and the existing system of the wharf.Mixed integer programming with linear constraints and improved chaotic PSO algorithm are used to solve problems of empty rail box selection and path coordination.By designing the overall structure of the system and analyzing function modules of each subsystem,a universal system implementation scheme is obtained.

Abstract:Considering the complexity of geological conditions and the existence of important facilities such as oil pipelines,underwater reef blasting,as an important means of port construction and waterway dredging,needs to ensure the safety of the project.To reduce the harm of shock waves,vibrations,and blasting surges generated by blasting to the surrounding environment,this study conducts a thorough analysis of geological conditions and selects appropriate blasting free surfaces to reduce the impact of blasting vibration.When conducting underwater reef blasting work,trial blasting research is conducted to achieve the best effect by adjusting blasting parameters such as charge amount and detonation time,and the stability and safety of blasting can be improved by designing the optimal charging structure.The research results can provide technical references for underwater reef blasting projects with hard geology,deep water depth,complex construction conditions,and the need to ensure the safety of important buildings in the construction area.

Abstract:The high-precision measurement of control points in karst topography areas holds significant value for regional topographic mapping and hydrological testing.Traditional surveying in karst regions is challenging due to sparse CORS stations and severe multipath effects in static surveys,rendering single-point GNSS static measurements inadequate for achieving the required accuracy.For the established 237 GNSS E-level control points,a specific GNSS static survey scheme is devised to enhance the precision of static measurements.The main approach involves adding one all-weather fixed base station in the center of the survey area,followed by the inclusion of one mobile base station during the survey to assist other N roaming stations.The computation process incorporates data from six continuously operating CORS stations.The final static survey results meet the required standards,with the average mean error in X coordinate of the control check points being 0.007 m,and in Y coordinate being 0.018 m.The geodetic heights measured are refined using the Guangxi quasi-geoid model,and when compared to the leveled heights,the differential mean error is 0.024 m,with all points falling below the allowable error limit.The “1+1+N” static survey mode significantly enhanced the measurement accuracy in karst topography areas,and the results refined with the quasi-geoid model meet the requirements for fourth-class level survey heights.

Abstract:The surface layer of an ore wharf yard is composed of loose silty fine sand by recently reclamation,and the underground water level and mud content are relatively high.In order to verify the feasibility of foundation treatment by dynamic compaction method and optimize the construction parameters,we set two testing areas with treatment thicknesses of 6 m and 9 m,carry out 2,000 kN·m and 4,000 kN·m energies of dynamic compaction in test areas,and at the same time monitor pore water pressure and dynamic compaction settlement in the construction process.After the completion of the treatment,we carry out SPT and load test,and give the formula of the hyperbolic relationship between dynamic compaction energy and tamping volume.The results show that the dissipation period of pore water pressure is about two days,and the optimal number of each dynamic compaction point is seven to eight.The bearing capacity of the foundation is significantly improved,reaching the design bearing capacity of 200 kPa after the dynamic compaction.